The coverage tests will allow measuring code coverage for all
Connectivity+Tethering code.

This is a combination of the current TetheringCoverageTests, and
FrameworksNetTests.

Adding min_sdk_version to the test prevents it from using deprecated
IoUtils utilities. Replace it with the non-deprecated alternative.

Bug: 187935317
Test: atest ConnectivityCoverageTests
Original-Change: https://android-review.googlesource.com/1731232
Merged-In: I5366e1cc9cd6ddb41f24718246381cc2b1cc1383
Change-Id: I5366e1cc9cd6ddb41f24718246381cc2b1cc1383

Bug: 148636687
Test: atest TetheringCoverageTests
      atest TetheringTests
      atest TetheringIntegrationTests
      atest NetworkStackTests
      atest CtsTetheringTest
Change-Id: I1f2a50f16894b05e988476520ba25baba0b60d88
Merged-In: I1f2a50f16894b05e988476520ba25baba0b60d88

Bug: 148636687
Test: atest TetheringCoverageTests
      atest TetheringTests
      atest TetheringIntegrationTests
      atest NetworkStackTests
      atest CtsTetheringTest
Change-Id: I1f2a50f16894b05e988476520ba25baba0b60d88

This test uses EthernetManager's ability to use test network
interfaces to test tethering. This provides a fairly realistic
integration test for Tethering and its callbacks, IpServer and
DhcpServer, and so on.

It is in a new integration/ directory under Tethering because I
didn't really know where to put it. It's fast enough to run in
presubmit, but it didn't seem to be appropriate to call it a
unit test, and in the future we could also use this test to do
some limited testing of real Ethernet tethering as well.

Bug: 150644681
Test: atest TetheringIntegrationTests:EthernetTetheringTest --rerun-until-failure 100
Merged-In: Ifcda70b73848b1fd4c26b031e53f0a6500cc93d4
Change-Id: Ifcda70b73848b1fd4c26b031e53f0a6500cc93d4

Ethernet tethering can be started via
startTethering(TETHERING_ETHERNET).

Test: flashed, enabled ethernet tethering, verified internet access on
      downstream.
Bug: 130840861

Merged-In: I34842acd94b972e440c3622f7617df10c18acf65
Change-Id: I34842acd94b972e440c3622f7617df10c18acf65
(cherry-pick with conflicts in test-current.txt)

Ethernet tethering can be started via
startTethering(TETHERING_ETHERNET).

Test: flashed, enabled ethernet tethering, verified internet access on
      downstream.
Bug: 130840861

Change-Id: I34842acd94b972e440c3622f7617df10c18acf65

".apex" is easy to confuse.
Rename as below:
apex: com.android.tethering.apex -> com.android.tethering
apk: com.android.tethering -> com.android.networkstack.tethering

Bug: 146471733
Test: build

Change-Id: I2c7647abb996539a3af6cfe0e0214a5e8927c0d6
Merged-In: I2c7647abb996539a3af6cfe0e0214a5e8927c0d6

".apex" is easy to confuse.
Rename as below:
apex: com.android.tethering.apex -> com.android.tethering
apk: com.android.tethering -> com.android.networkstack.tethering

Bug: 146471733
Test: build

Change-Id: I2c7647abb996539a3af6cfe0e0214a5e8927c0d6

TetheringConfiguration is a utility class to encapsulate the various
configuration elements.

Bug: 136040414
Test: -build, flash, boot
      -atest TetheringTests

Change-Id: I9434ab213bc5e0fca59f14a6c8cea554abefc3a4